/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.i18n;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import javax.annotation.PostConstruct;
import lombok.RequiredArgsConstructor;
import org.hisp.dhis.common.BaseIdentifiableObject;
import org.hisp.dhis.common.IdentifiableObject;
import org.hisp.dhis.common.comparator.LocaleNameComparator;
import org.hisp.dhis.i18n.locale.I18nLocale;
import org.hisp.dhis.system.util.LocaleUtils;
import org.hisp.dhis.user.UserDetails;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@RequiredArgsConstructor
@Service("org.hisp.dhis.i18n.118nLocaleService")
public class DefaultI18nLocaleService implements I18nLocaleService {
  private Map<String, String> languages = new LinkedHashMap<>();

  private Map<String, String> countries = new LinkedHashMap<>();

  private final I18nLocaleStore localeStore;

  /** Load all ISO languages and countries into mappings. */
  @PostConstruct
  public void init() {
    List<IdentifiableObject> langs = new ArrayList<>();
    List<IdentifiableObject> countrs = new ArrayList<>();

    for (String lang : Locale.getISOLanguages()) {
      langs.add(new BaseIdentifiableObject(lang, lang, new Locale(lang).getDisplayLanguage()));
    }

    for (String country : Locale.getISOCountries()) {
      countrs.add(
          new BaseIdentifiableObject(
              country, country, new Locale("en", country).getDisplayCountry()));
    }

    Collections.sort(langs);
    Collections.sort(countrs);

    for (IdentifiableObject lang : langs) {
      languages.put(lang.getCode(), lang.getName());
    }

    for (IdentifiableObject countr : countrs) {
      countries.put(countr.getCode(), countr.getName());
    }
  }

  // -------------------------------------------------------------------------
  // I18nLocaleService implementation
  // -------------------------------------------------------------------------

  @Override
  @Transactional(readOnly = true)
  public Map<String, String> getAvailableLanguages() {
    return languages;
  }

  @Override
  @Transactional(readOnly = true)
  public Map<String, String> getAvailableCountries() {
    return countries;
  }

  @Override
  @Transactional
  public I18nLocale addI18nLocale(String language, String country) {
    String languageName = languages.get(language);
    String countryName = countries.get(country);

    if (language == null || languageName == null) {
      throw new IllegalArgumentException("Invalid Language.");
    }

    if (country != null && countryName == null) {
      throw new IllegalArgumentException("Invalid country.");
    }

    String localeStr = LocaleUtils.getLocaleString(language, country, null);
    Locale locale = LocaleUtils.getLocale(localeStr);

    I18nLocale i18nLocale = new I18nLocale(locale);

    saveI18nLocale(i18nLocale);

    return i18nLocale;
  }

  @Override
  @Transactional
  public void saveI18nLocale(I18nLocale locale) {
    localeStore.save(locale);
  }

  @Override
  @Transactional
  public void saveI18nLocale(I18nLocale locale, UserDetails actingUser) {
    localeStore.save(locale, actingUser, false);
  }

  @Override
  @Transactional(readOnly = true)
  public I18nLocale getI18nLocale(int id) {
    return localeStore.get(id);
  }

  @Override
  @Transactional(readOnly = true)
  public I18nLocale getI18nLocaleByUid(String uid) {
    return localeStore.getByUid(uid);
  }

  @Override
  @Transactional(readOnly = true)
  public I18nLocale getI18nLocale(Locale locale) {
    return localeStore.getI18nLocaleByLocale(locale);
  }

  @Override
  @Transactional
  public void deleteI18nLocale(I18nLocale locale) {
    localeStore.delete(locale);
  }

  @Override
  @Transactional(readOnly = true)
  public int getI18nLocaleCount() {
    return localeStore.getCount();
  }

  @Override
  @Transactional(readOnly = true)
  public List<Locale> getAllLocales() {
    List<Locale> locales = new ArrayList<>();

    for (I18nLocale locale : localeStore.getAll()) {
      locales.add(LocaleUtils.getLocale(locale.getLocale()));
    }

    locales.sort(LocaleNameComparator.INSTANCE);

    return locales;
  }

  @Override
  @Transactional(readOnly = true)
  public List<I18nLocale> getAllI18nLocales() {
    return localeStore.getAll();
  }
}
